To get the first shot of the wee royal leaving St. Mary's Hospital in London, news photographers have staked out territory across the street, marking their spots with colored tape and positioning their stepladders, Time reports.

As we wait for that highly anticipated photo, we thought we'd take a look back at a few other babies who made a royal entrance.

Queen Elizabeth II

You won't find any photos of the future Queen Elizabeth leaving the hospital back in 1926. She was born at her maternal grandparents' house, 17 Bruton Street, in Mayfair, London, and as her official website puts it:

"At the time she stood third in line of succession to the throne after Edward, Prince of Wales (later King Edward VIII), and her father, The Duke of York. But it was not expected that her father would become King, or that she would become Queen."

If you've seen The King's Speech, you know the rest of the story: Edward VIII abdicated and Elizabeth's dad, George VI (you may know him as Colin Firth), took over.

Before all that, though, Elizabeth's birth was greeted with enthusiasm. Ben Pimlott writes in his biography The Queen:

"Despite the distance of the child from the throne, the newspapers took a keen interest in the birth. ... Such, indeed, was the excitement that a crowd swiftly gathered in Bruton Street in the hope of seeing the Princess, to greet the messenger boys who arrived with telegrams and presents, and to cheer [her mother's] royal callers."

Prince Charles

Twenty-two years later, Elizabeth gave birth to Charles — just a few years before becoming queen. Born in the still war-ravaged Britain of 1948, the little prince was issued "a child's green ration book" on the day of his christening, The New York Times reported. (That entitled him to "extra milk, concentrated orange juice and government-packed cod liver oil," The Associated Press noted, "the same as every other baby in the kingdom.")

The christening also provided the first photo of the new Royal Highness. "Hardened press photographers pronounced the Prince a model baby — healthy, blue-eyed, wispy-haired and well-behaved," according to the Times account.

Prince William

In 1982, William was born in the same hospital where his wife, Catherine, is expected to give birth — St. Mary's in Paddington. USA Today reports that "he was the first heir apparent and future monarch to be born in a hospital."

William was born 16 hours after his mother, Princess Diana, arrived at St. Mary's. The BBC wrote:

"Outside the hospital crowds had gathered to wait for news of the birth, with some saying they would wait through the night if necessary. Flowers arrived all day long and were taken into the hospital. Thousands also gathered outside Buckingham Palace, where the birth was formally announced."

"Outside St. Mary's Hospital ... more than 300 reporters, TV technicians and curious onlookers milled anxiously behind a double row of police barricades and dozens of photographers and TV cameramen perched atop ladders nearby. ... A TV crewman, hooked up to his home office through head-phones, broke the news to the mob outside St. Mary's. 'It's a boy!' he shouted. The crowd exploded in cheers. At that a rubbernecking motorist in front of the hospital drove into the side of an ambulance."

Given the photographers now converging on London, it seems safe to say Harry's new niece or nephew — possibly "the world's most famous baby" — will cause a scene, as well.